US Troops Kill 3 Civilians, Afghan Spokesman Says

KABUL, Afghanistan -- American troops opened fire after a roadside bomb hit their convoy in Afghanistan's Nangarhar province on Monday, killing three civilians, a spokesman for the provincial government claimed.

"After the explosion, the foreign forces started shooting and killed a man and his two sons," Attaullah Khogyani said.

U.S. Forces-Afghanistan confirmed that a convoy of American and Afghan personnel had been struck by a bomb and small arms fire in the area before it returned fire in self defense.

However, a statement said it had not received any "official allegations" of civilian casualties, and that an investigation into the incident had been launched.

"We take civilian casualties very seriously and all allegations are thoroughly investigated," the statement said.